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  1. Obs89

    1997 chevy k1500 P0300

    i have talked to another guy with same truck and built engine and he said if ur idle isnt set high enough the computer is going to think its misfiring. so i held rpm around 8-9 and misses went away so im going to with that. just letting everyone know that.
  2. Obs89

    1997 Chevy k1500

    long story short.its the computer. There is no way thats its the wireing. I plugged new o2's in and the readings never changed. So unless theres a saftey back up reading prgramed in the black box. Then the guy before me had it programed. I do know it was programed idk for what but he did say he...
  3. Obs89

    1997 Chevy k1500

    ^
  4. Obs89

    1997 Chevy k1500

    How can I fix it. The black box has been tuned to read o2 at the perfect abt with out it having any o2 sensors. I even plugged some in and it didn’t even try ro read them.
  5. Obs89

    1997 Chevy k1500

    the computer is programed not read them. so when i do the computer swap. it will be able to read it.
  6. Obs89

    1997 Chevy k1500

    No even when I plugged some in it didn’t read, so am about to do a 0411 swap and put some in it.
  7. Obs89

    1997 Chevy k1500

    Temp sensor and maf helped alot aswell.
  8. Obs89

    1997 Chevy k1500

    I found my problem it was the harness I beleive. grounding cause it fell on egr exhaust line. I zip tied it up and haven’t had problems since I will keep u updated. But I noticed mine by turning key one and seeing the injector stuck open shooting with just key on engine off
  9. Obs89

    1997 chevy k1500 P0300

    i beleive my iac stays at 36 at idle and my throttle body is clean. I cleaned it when i did my spider injectors.Also its a new cap and rotar also the distribor isnt to old maybe like 4 months .
  10. Obs89

    1997 chevy k1500 P0300

    I also forgot to mention that it’s only misfiring at idle.
  11. Obs89

    1997 chevy k1500 P0300

    I have a 97 chevy with brand new injectors and temp sensor,cap,rotor,plugs,plug wires. EGR valve. and new distributer, new fuel pump and filter. clean grounds. It seems to missfireing on 1 and 5 and it some time counts up on cylnder 2 but i believe it may be a false count. i have a new crank...
  12. Obs89

    1997 Chevy k1500

    Dead thread but hate seeing people leave them with no answer. my problem seemed to be a stuck open injector. Caused a wire in the harness by the brake booster coming from the spider injector i still have yet to find which on it is . i can just go shake it and it will go away. so i think i will...
  13. Obs89

    1997 Chevy k1500

    New cap/roter on. And only cylinders that are missing now and are counting is 6 and 3 I noticed when I plugged a new spark plug in it stopped missing for a min then started back. I assume it got gassed up and failed. My only assumption left if leaking reg or spider injector. Even tho it has the...
  14. Obs89

    1997 Chevy k1500

    I put a new fuel pump in and pressure is better around 55 and like 50 at idle I think I will double check Tommorow. Also I got a new cap and rotor from Amazon and will arrive tmo I’m going to put it on aswell. And if non of these work I will swap the pcm over. I have a pic of how much gas was...
  15. Obs89

    1997 Chevy k1500

    That’s what I’m thinking. But I did take apart my upper intake a min ago and checked every injector to see if they were leaking and they aren’t. Also I believe the truck runs fine with low pressure because it has the upgraded spider injectors I noticed that today when I took them apart. Also...
  16. Obs89

    1997 Chevy k1500

    That’s what I’m thinking. But I think mu Problem is a leaking spider or regulated. And a bad fuel pump. But also the coil has never been changed either
  17. Obs89

    1997 Chevy k1500

    I understand but my truck is saying it has 02 sensors and reading them when they do not exist
  18. Obs89

    1997 Chevy k1500

  19. Obs89

    1997 Chevy k1500

    Everything checks out as it should . Fuel trims are as stated earlier. I will attach an picture. dumb qustion if the truck has been programmed to read .498 volts at 02.( I do not have any) wouldn’t it be in a closed loop sense they programmed that. Also I just changed them 3 months ago and...
  20. Obs89

    1997 Chevy k1500

    Also I pinched the return line off going back to the fuel pump to see if the the pressure raised when the fuel pump is initiated. And I didn’t see the psi rise at all. So I’m thinking a new fuel pump is a must. But definitely not the main problem. I’m no genius but if the fuel pressure is that...
  21. Obs89

    1997 Chevy k1500

    Egr valve*
  22. Obs89

    1997 Chevy k1500

    The temp sensor by eye valve and the sending sensor on block by manifold or headers in my case. Look up temperature sending sensor that’s how I found it. So that’s what I call it.
  23. Obs89

    1997 Chevy k1500

    190 on scan tool. And on dash it is the middle mark between 100 and 210.
  24. Obs89

    1997 Chevy k1500

  25. Obs89

    1997 Chevy k1500

    I know. When I’m saying I cannot find it. When I hook up the scanner to truck I do not know how to find the relearn on the scanner, to test it.

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